'\" t
.\"     Title: chpasswd
.\"    Author: Julianne Frances Haugh
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 18/06/2024
.\"    Manual: System Management Commands
.\"    Source: shadow-utils 4.16.0
.\"  Language: French
.\"
.TH "CHPASSWD" "8" "18/06/2024" "shadow\-utils 4\&.16\&.0" "System Management Commands"
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.SH "NOM"
chpasswd \- Mettre \(`a jour des mots de passe par lot
.SH "SYNOPSIS"
.HP \w'\fBchpasswd\fR\ 'u
\fBchpasswd\fR [\fIoptions\fR]
.SH "DESCRIPTION"
.PP
The
\fBchpasswd\fR
command reads a list of user name and password pairs from standard input and uses this information to update a group of existing users\&. Each line is of the format:
.PP
\fIuser_name\fR:\fIpassword\fR
.PP
By default the passwords must be supplied in clear\-text, and are encrypted by
\fBchpasswd\fR\&. Also the password age will be updated, if present\&.
.PP
The default encryption algorithm can be defined for the system with the
\fBENCRYPT_METHOD\fR
or
\fBMD5_CRYPT_ENAB\fR
variables of
/etc/login\&.defs, and can be overwritten with the
\fB\-e\fR,
\fB\-m\fR, or
\fB\-c\fR
options\&.
.PP
\fBchpasswd\fR
first updates all the passwords in memory, and then commits all the changes to disk if no errors occurred for any user\&.
.PP
Cette commande est destin\('ee aux gros syst\(`emes pour lesquels un nombre importants de comptes sont cr\('e\('es en une seule fois\&.
.SH "OPTIONS"
.PP
The options which apply to the
\fBchpasswd\fR
command are:
.PP
\fB\-c\fR, \fB\-\-crypt\-method\fR\ \&\fIMETHOD\fR
.RS 4
Utiliser la m\('ethode pr\('ecis\('ee pour chiffrer les mots de passe\&.
.sp
The available methods are
\fIDES\fR,
\fIMD5\fR, \fISHA256\fR, \fISHA512\fR
and
\fINONE\fR
if your libc supports these methods\&.
.sp
By default (if none of the
\fB\-c\fR,
\fB\-m\fR, or
\fB\-e\fR
options are specified), the encryption method is defined by the
\fBENCRYPT_METHOD\fR
or
\fBMD5_CRYPT_ENAB\fR
variables of
/etc/login\&.defs\&.
.RE
.PP
\fB\-e\fR, \fB\-\-encrypted\fR
.RS 4
Indiquer que les mots de passe fournis sont chiffr\('es\&.
.RE
.PP
\fB\-h\fR, \fB\-\-help\fR
.RS 4
Afficher un message d\*(Aqaide et quitter\&.
.RE
.PP
\fB\-m\fR, \fB\-\-md5\fR
.RS 4
Permettre d\*(Aqutiliser le chiffrement MD5, plut\(^ot que DES, lorsque les mots de passe fournis ne sont pas chiffr\('es\&.
.RE
.PP
\fB\-R\fR, \fB\-\-root\fR\ \&\fICHROOT_DIR\fR
.RS 4
Apply changes in the
\fICHROOT_DIR\fR
directory and use the configuration files from the
\fICHROOT_DIR\fR
directory\&. Only absolute paths are supported\&.
.RE
.PP
\fB\-P\fR, \fB\-\-prefix\fR\ \&\fIPREFIX_DIR\fR
.RS 4
Apply changes to configuration files under the root filesystem found under the directory
\fIPREFIX_DIR\fR\&. This option does not chroot and is intended for preparing a cross\-compilation target\&. Some limitations: NIS and LDAP users/groups are not verified\&. PAM authentication is using the host files\&. No SELINUX support\&.
.RE
.PP
\fB\-s\fR, \fB\-\-sha\-rounds\fR\ \&\fIROUNDS\fR
.RS 4
Utiliser le nombre de rounds pr\('ecis\('e pour chiffrer les mots de passe\&.
.sp
You can only use this option with crypt method:
\fISHA256\fR \fISHA512\fR
.sp
By default, the number of rounds for SHA256 or SHA512 is defined by the SHA_CRYPT_MIN_ROUNDS and SHA_CRYPT_MAX_ROUNDS variables in
/etc/login\&.defs\&.
.sp
A minimal value of 1000 and a maximal value of 999,999,999 will be enforced for SHA256 and SHA512\&. The default number of rounds is 5000\&.
.RE
.SH "AVERTISSEMENTS"
.PP
Pensez \(`a configurer les permissions ou umask afin d\*(Aqemp\(^echer la lecture des fichiers non chiffr\('es par les d\*(Aqautres utilisateurs\&.
.SH "CONFIGURATION"
.PP
The following configuration variables in
/etc/login\&.defs
change the behavior of this tool:

.SH "FICHIERS"
.PP
/etc/passwd
.RS 4
Informations sur les comptes des utilisateurs\&.
.RE
.PP
/etc/shadow
.RS 4
Informations s\('ecuris\('ees sur les comptes utilisateurs\&.
.RE
.PP
/etc/login\&.defs
.RS 4
Configuration de la suite des mots de passe cach\('es \(Fo\ \&shadow password\ \&\(Fc\&.
.RE
.SH "VOIR AUSSI"
.PP
\fBpasswd\fR(1),
\fBnewusers\fR(8),
\fBlogin.defs\fR(5),
\fBuseradd\fR(8)\&.
